Trail of trial lenses.
Keeler
Richard
R
Singh
Arun D
AD
Dua
Harminder S
HS
D004739:England; D005139:Eyeglasses / Q000266:history*; D049670:History, 17th Century; D049671:History, 18th Century; D049672:History, 19th Century; D006801:Humans; D007909:Lenses / Q000266:history*; D008297:Male; D009907:Optometry / Q000266:history*